Peculiar ramps shorting problem Ive recently completed my first reprap, and after a couple of weeks of getting some really nice results out of it I stupidly shorted the RAMPS board around the end stop terminals while the printer was on... DOH!. since then i am still able to turn the printer on and it will behave normally for a while, then usually after about 10-15 minuets everything looses power, and the voltage controller on the arduino starts to heat up rapidly. ive since replaced the RAMPS board and i'm having the same issue, whats strange is the controller always seems to turn off when i press the button on my smart controller, although it has also turned off without me touching a thing. the arduino seems fine and behaves normally when plugged into the pc. Any advice on this would be much appreciated, im getting pretty frustrated at this point Thanks! https://reprap.org/forum/read.php?219,441061,441061#msg-441061 Fri, 07 Aug 2026 07:52:14 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?219,441061,448729#msg-448729 Re: Peculiar ramps shorting problem https://reprap.org/forum/read.php?219,441061,448729#msg-448729 NeilRG RAMPS Electronics Mon, 29 Dec 2014 09:29:35 -0500 https://reprap.org/forum/read.php?219,441061,441767#msg-441767 Re: Peculiar ramps shorting problem https://reprap.org/forum/read.php?219,441061,441767#msg-441767 cdru RAMPS Electronics Tue, 09 Dec 2014 16:37:32 -0500 https://reprap.org/forum/read.php?219,441061,441695#msg-441695 Re: Peculiar ramps shorting problem https://reprap.org/forum/read.php?219,441061,441695#msg-441695
Quote
fisher
Anyone any ideas on this? i cant work out why it would work fine and then appear to short out of nowhere, i noticed that the voltage controller is getting a bit warm when its working before it turns off, is this normal?

Are you running an LCD screen off the 5V rail? If so, then it is normal for the regulator to run warm because of the current taken by the LCD backlight - especially if the LCD is the 12864 graphics type, which takes about 100mA backlight current. In my designs, I generally power the backlight from the input voltage (e.g. 12V) via a series resistor, to keep the dissipation in the voltage regulator reasonable.

I guess it's possible that the short you had has damaged the voltage regulator, which now gives up when it gets warm enough. Although the voltage regulator is supposed to be short-circuit protected, I've seen other posts say that if you miswire the endstop switches so as to cause a short between +5V and ground, the voltage regulator often fails.]]> dc42 RAMPS Electronics Tue, 09 Dec 2014 13:30:50 -0500 https://reprap.org/forum/read.php?219,441061,441585#msg-441585 Re: Peculiar ramps shorting problem https://reprap.org/forum/read.php?219,441061,441585#msg-441585 enif RAMPS Electronics Tue, 09 Dec 2014 09:46:00 -0500 https://reprap.org/forum/read.php?219,441061,441437#msg-441437 Re: Peculiar ramps shorting problem https://reprap.org/forum/read.php?219,441061,441437#msg-441437 fisher RAMPS Electronics Tue, 09 Dec 2014 04:23:06 -0500 https://reprap.org/forum/read.php?219,441061,441061#msg-441061 Peculiar ramps shorting problem https://reprap.org/forum/read.php?219,441061,441061#msg-441061 fisher RAMPS Electronics Mon, 08 Dec 2014 07:39:00 -0500